TEXAS INSTRUMENTS TPA122 Technical data

TPA122

150-mW STEREO AUDIO POWER AMPLIFIER

SLOS211D – AUGUST1998 – REVISED OCT OBER 2002

D

150 mW Stereo Output

D

PC Power Supply Compatible
– Fully Specified for 3.3 V and 5 V

Operation

– Operation to 2.5 V

D

Pop Reduction Circuitry

D

Internal Midrail Generation

D

Thermal and Short-Circuit Protection

D

Surface-Mount Packaging

BYPASS

D OR DGN PACKAGE

(TOP VIEW)

VO1

IN–

GND

1
2
3
4

8
7
6
5

V

DD

VO2
IN2–
SHUTDOWN

– PowerPAD MSOP
– SOIC

D

Pin Compatible With LM4880 and LM4881
(SOIC)

description

The TP A122 is a stereo audio power amplifier packaged in either an 8-pin SOIC, or an 8-pin PowerPADMSOP
package capable of delivering 150 mW of continuous RMS power per channel into 8-Ω loads. Amplifier gain
is externally configured by means of two resistors per input channel and does not require external compensation
for settings of 1 to 10.

THD+N when driving an 8-Ω load from 5 V is 0.1% at 1 kHz, and less than 2% across the audio band of 20 Hz
to 20 kHz. For 32-Ω loads, the THD+N is reduced to less than 0.06% at 1 kHz, and is less than 1% across the
audio band of 20 Hz to 20 kHz. For 10-kΩ loads, the THD+N performance is 0.01% at 1 kHz, and less than 0.02%
across the audio band of 20 Hz to 20 kHz.

typical application circuit

Audio

Input

Audio

Input

From Shutdown

Control Circuit

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

R

I

C

I

C

B

R

I

C

I

R

F

R

F

2

3

6

5

320 kΩ 320 kΩ

IN1–

BYPASS

IN2–

SHUTDOWN

VDD/2

–

+

–

+

Bias

Control

V

DD

VO1

VO2

8

1

C

7

C

4

V

DD

C

S

C

C

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  2002, Texas Instruments Incorporated

1

TPA122

MSOP

I/O

DESCRIPTION

150-mW STEREO AUDIO POWER AMPLIFIER

SLOS211D – AUGUST1998 – REVISED OCTOBER 2002

AVAILABLE OPTIONS
PACKAGED DEVICES

T

A

–40°C to 85°C TPA122D TPA122DGN TI AAE

†

The D and DGN package is available in left-ended tape and reel only (e.g., TPA122DR,
TPA122DGNR).

SMALL OUTLINE

(D)

†

Terminal Functions

TERMINAL

NAME NO.

BYPASS 3 I Tap to voltage divider for internal mid-supply bias supply. Connect to a 0.1 µF to 1 µF low ESR capacitor for

GND 4 I GND is the ground connection.
IN1– 2 I IN1– is the inverting input for channel 1.
IN2– 6 I IN2– is the inverting input for channel 2.
SHUTDOWN 5 I Puts the device in a low quiescent current mode when held high
V

DD

VO1 1 O VO1 is the audio output for channel 1.
VO2 7 O VO2 is the audio output for channel 2.

8 I VDD is the supply voltage terminal.

best performance.

MSOP

(DGN)

†

Symbolization

absolute maximum ratings over operating free-air temperature (unless otherwise noted)

†

Supply voltage, VDD 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, V

–0.3 V to VDD + 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

Continuous total power dissipation internally limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating junction temperature range, T
Storage temperature range, T

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

–40°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

J

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

DISSIPATION RATING TABLE

PACKAGE

D 725 mW 5.8 mW/°C 464 mW 377 mW

DGN 2.14 W

‡

Please see the Texas Instruments document, PowerPAD Thermally Enhanced Package Application Report
(SLMA002), for more information on the PowerPAD package. The thermal data was measured on a PCB
layout based on the information in the section entitled T exas Instruments Recommended Board for PowerPAD
on page 33 of that document.

TA ≤ 25°C

POWER RATING

‡

DERATING FACTOR

ABOVE TA = 25°C

17.1 mW/°C 1.37 W 1.11 W

TA = 70°C

POWER RATING

POWER RATING

TA = 85°C

recommended operating conditions

MIN MAX UNIT

Supply voltage, V
Operating free-air temperature, T

High-level input voltage, VIH (SHUTDOWN) 0.80 × V
Low-level input voltage, VIL (SHUTDOWN) 0.40 × V

DD

A

2.5 5.5 V

–40 85 °C

DD

DD

V
V

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPA122

150-mW STEREO AUDIO POWER AMPLIFIER

SLOS211D – AUGUST1998 – REVISED OCTOBER 2002

dc electrical characteristics at TA = 25°C, VDD = 3.3 V (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

OO

PSRR Power supply rejection ratio VDD = 3.2 V to 3.4 V 83 dB
I

DD

I

DD(SD)

Z

I

ac operating characteristics, VDD= 3.3 V, TA = 25°C, RL = 8 Ω

P

O

THD+N Total harmonic distortion + noise PO = 70 mW, 20–20 kHz 2%
B

OM

SNR Signal-to-noise ratio PO = 100 mW 100 dB
V

n

†

Measured at 1 kHz

Output offset voltage 10 mV

Supply current VDD = 2.5, SHUTDOWN = 0 V 1.5 3 mA
Supply current in SHUTDOWN mode VDD = 2.5, SHUTDOWN = V

Input impedance >1 MΩ

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Output power (each channel) THD ≤ 0.1% 70

Maximum output power BW G = 10, THD <5% >20 kHz
Phase margin Open loop 58°
Supply ripple rejection f = 1 kHz 68 dB
Channel/channel output separation f = 1 kHz 86 dB

Noise output voltage 9.5 µV(rms)

DD

10 50 µA

†

mW

dc electrical characteristics at TA = 25°C, VDD = 5.5 V (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

OO

PSRR Power supply rejection ratio VDD = 4.9 V to 5.1 V 76 dB
I

DD

I

DD(SD)

|IIH| High-level input current (SHUTDOWN) VDD = 5.5 V, VI = V
|IIL| Low-level input current (SHUTDOWN) VDD = 5.5 V, VI = 0 V 1 µA
Z

I

Output offset voltage 10 mV

Supply current SHUTDOWN = 0 V 1.5 3 mA
Supply current in SHUTDOWN mode SHUTDOWN = V

Input impedance >1 MΩ

DD

DD

60 100 µA

1 µA

ac operating characteristics, VDD=5 V, TA = 25°C, RL = 8 Ω

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

P

O

THD+N Total harmonic distortion + noise PO = 150 mW, 20–20 kHz 2%
B

OM

SNR Signal-to-noise ratio PO = 150 mW 100 dB
V

n

†

Measured at 1 kHz

Output power (each channel) THD ≤ 0.1% 70† mW

Maximum output power BW G = 10, THD <5% >20 kHz
Phase margin Open loop 56°
Supply ripple rejection ratio f = 1 kHz 68 dB
Channel/channel output separation f = 1 kHz 86 dB

Noise output voltage 9.5 µV(rms)

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TPA122
150-mW STEREO AUDIO POWER AMPLIFIER

SLOS211D – AUGUST1998 – REVISED OCTOBER 2002

ac operating characteristics, VDD= 3.3 V, TA = 25°C, RL = 32 Ω

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

P

O

THD+N Total harmonic distortion + noise PO = 30 mW, 20–20 kHz 0.5%
B

OM

SNR Signal-to-noise ratio PO = 100 mW 100 dB
V

n

†

Measured at 1 kHz

Output power (each channel) THD ≤ 0.1% 40

Maximum output power BW G = 10, THD <2% >20 kHz
Phase margin Open loop 58°
Supply ripple rejection f = 1 kHz 68 dB
Channel/channel output separation f = 1 kHz 86 dB

Noise output voltage 9.5 µV(rms)

ac operating characteristics, VDD=5 V, TA = 25°C, RL = 32 Ω

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

P

O

THD+N Total harmonic distortion + noise PO = 60 mW, 20–20 kHz 0.4%
B

OM

SNR Signal-to-noise ratio PO = 150 mW 100 dB
V

n

†

Measured at 1 kHz

Output power (each channel) THD ≤ 0.1% 40† mW

Maximum output power BW G = 10, THD <2% >20 kHz
Phase margin Open loop 56°
Supply ripple rejection f = 1 kHz 68 dB
Channel/channel output separation f = 1 kHz 86 dB

Noise output voltage 9.5 µV(rms)

†

mW

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPA122

150-mW STEREO AUDIO POWER AMPLIFIER

SLOS211D – AUGUST1998 – REVISED OCTOBER 2002

TYPICAL CHARACTERISTICS

Table of Graphs

FIGURE

1, 2, 4, 5, 7, 8,

vs Frequency

THD+N Total harmonic distortion plus noise

vs Power output

Supply ripple rejection vs Frequency 19, 20

V

n

I

DD

SNR Signal-to-noise ratio vs Voltage gain 35

Output noise voltage vs Frequency 21, 22
Crosstalk vs Frequency
Mute attenuation vs Frequency 27, 28

Open-loop gain and phase margin vs Frequency 29, 30
Output power vs Load resistance 31, 32
Phase vs Frequency 39–44
Supply current vs Supply voltage 33

Closed-loop gain vs Frequency 39–44
Power dissipation/amplifier vs Output power 45, 46

10, 11, 13, 14,

16, 17, 34, 36

3, 6, 9,

12, 15, 18

23–26,

37, 38

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

TPA122
150-mW STEREO AUDIO POWER AMPLIFIER

SLOS211D – AUGUST1998 – REVISED OCTOBER 2002

TYPICAL CHARACTERISTICS

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

10

VDD = 3.3 V
PO = 30 mW
CB = 1 µ F
RL = 32 Ω

THD+N –Total Harmonic Distortion + Noise – %

1

AV = –10 V/V

0.1

0.01

0.001
20 100 1k 10k 20k

AV = –5 V/V

f – Frequency – Hz

Figure 1

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

OUTPUT POWER

10

VDD = 3.3 V
RL = 32 Ω
AV = –1 V/V
CB = 1 µF

1

10 kHz

AV = –1 V/V

20 kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

10

VDD = 3.3 V
AV = –1 V/V
RL = 32 Ω
CB = 1 µ F

1

PO = 15 mW

PO = 10 mW

PO = 30 mW

f – Frequency – Hz

THD+N –Total Harmonic Distortion + Noise – %

0.1

0.01

0.001
20 100 1k 10k 20k

Figure 2

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

10

VDD = 5 V
PO = 60 mW
RL = 32 Ω
CB = 1 µF

1

AV = –10 V/V

0.1

THD+N –Total Harmonic Distortion + Noise – %

0.1
20 Hz

0.01
11050

PO – Output Power – mW

1 kHz

THD+N –Total Harmonic Distortion + Noise – %

0.01

0.001
20 100 1k 10k 20k

Figure 3

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

AV = –5 V/V

AV = –1 V/V

f – Frequency – Hz

Figure 4

150-mW STEREO AUDIO POWER AMPLIFIER

TYPICAL CHARACTERISTICS

TPA122

SLOS211D – AUGUST1998 – REVISED OCTOBER 2002

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

10

VDD = 5 V
RL = 32 Ω
AV = –1 V/V
CB = 1 µF

1

PO = 30 mW

PO = 15 mW

PO = 60 mW

f – Frequency – Hz

THD+N –Total Harmonic Distortion + Noise – %

0.1

0.01

0.001
20 100 1k 10k 20k

Figure 5

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

10

VDD = 3.3 V
RL = 10 kΩ
PO = 100 µF
CB = 1 µF

1

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

OUTPUT POWER

10

VDD = 5 V
AV = –1 V/V
RL = 32 Ω
CB = 1 µF

20 kHz

1

10 kHz

0.1

20 Hz

THD+N –Total Harmonic Distortion + Noise – %

0.01

0.002 0.01 0.1 0.2
PO – Output Power – W

1 kHz

Figure 6

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

10

VDD = 3.3 V
RL = 10 kΩ
AV = –1 V/V
CB = 1 µF

1

THD+N –Total Harmonic Distortion + Noise – %

0.1

AV = –5 V/V

0.01

AV = –2 V/V

0.001
20 100 1k 10k 20k

f – Frequency – Hz

Figure 7

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THD+N –Total Harmonic Distortion + Noise – %

0.1

PO = 45 µW

0.01

PO = 130 µW

0.001
20 100 1k 10k 20k

f – Frequency – Hz

PO = 90 µW

Figure 8

7

TPA122
150-mW STEREO AUDIO POWER AMPLIFIER

SLOS211D – AUGUST1998 – REVISED OCTOBER 2002

TYPICAL CHARACTERISTICS

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

OUTPUT POWER

10

VDD = 3.3 V
RL = 10 kΩ
AV = –1 V/V
CB = 1 µF

1

THD+N –Total Harmonic Distortion + Noise – %

0.1

0.01

0.001
5 10 100 200

PO – Output Power – µW

20 Hz

20 Hz

1 kHz

Figure 9

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

10

VDD = 5 V
RL = 10 kΩ
AV = –1 V/V
CB = 1 µF

1

10 kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

10

VDD = 5 V
RL = 10 kΩ
PO = 300 µW
CB = 1 µF

1

THD+N –Total Harmonic Distortion + Noise – %

0.1

AV = –1 V/V

0.01

0.001
20 100 1k 10k 20k

f – Frequency – Hz

AV = –5 V/V

AV = –2 V/V

Figure 10

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

OUTPUT POWER

10

VDD = 5 V
RL = 10 kΩ
AV = –1 V/V
CB = 1 µ F

1

0.1

0.01

PO = 100 µW

THD+N –Total Harmonic Distortion + Noise – %

0.001
20 100 1k 10k 20k

8

PO = 300 µW

f – Frequency – Hz

Figure 11

THD+N –Total Harmonic Distortion + Noise – %

0.1

0.01

0.001
5 10 100 500

PO = 200 µW

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

20 kHz

20 Hz

10 kHz

PO – Output Power – µW

Figure 12

1 kHz